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  1. #include <iostream>
  2. #include <bits/stdc++.h>
  3. using namespace std;
  4.  
  5. int sum_fn(int n){
  6. 	if(n==0) return 0;
  7.  
  8. 	return n+sum_fn(n-1);
  9. }
  10. int main(){
  11. 	int n;
  12. 	cin>>n;
  13. 	cout<<sum_fn(n);
  14. 	return 0;
  15. }
Success #stdin #stdout 0.01s 5328KB
comments (?)
stdin 
10
stdout 
55
https://ideone.com/tLCluA
language:
C++ (gcc 8.3)
created:
4 days ago
visibility:
public

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